Photoconductive Generation and Detection of Guided-Wave and Free-Space Terahertz Waveforms

Abdulhakem Y. ELEZZABI
Jonathan F. HOLZMAN

IEICE TRANSACTIONS on Electronics   Vol.E86-C    No.7    pp.1218-1225
Publication Date: 2003/07/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Issue on Recent Progress in Microwave and Millimeter-wave Photonics Technologies)
Category: Signal Generation and Processing Based on MWP Techniques
ultrafast optics,  femtosecond technology,  photonic switch,  semiconductor optical devices,  

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We report on several photoconductive (PC) geometries for the generation of both guided-wave and free-space terahertz (THz) waveforms. It is found that guided-wave THz electrical waveforms can be produced through both PC self-switching and frozen wave generation--eliminating the need for an ultrashort carrier lifetime in the semiconductor substrate. The concept of PC switching is also applied to the generation of free-space THz waveforms, and various ZnSe detectors are investigated as potential electro-optic THz sensors.